EP0632550A2 - Modulation de diodes laser - Google Patents
Modulation de diodes laser Download PDFInfo
- Publication number
- EP0632550A2 EP0632550A2 EP94304780A EP94304780A EP0632550A2 EP 0632550 A2 EP0632550 A2 EP 0632550A2 EP 94304780 A EP94304780 A EP 94304780A EP 94304780 A EP94304780 A EP 94304780A EP 0632550 A2 EP0632550 A2 EP 0632550A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser diode
- semiconductor laser
- optical
- semiconductor
- optical modulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
- H01S5/0265—Intensity modulators
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/02208—Mountings; Housings characterised by the shape of the housings
- H01S5/02216—Butterfly-type, i.e. with electrode pins extending horizontally from the housings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
- H01S5/06226—Modulation at ultra-high frequencies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/30107—Inductance
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3011—Impedance
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
- H01S5/02251—Out-coupling of light using optical fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0233—Mounting configuration of laser chips
- H01S5/02345—Wire-bonding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
- H01S5/2205—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers
- H01S5/2222—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers having special electric properties
- H01S5/2224—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers having special electric properties semi-insulating semiconductors
Definitions
- Figs. 3A and 3B show a configuration of such a MI-DFB-LD.
- Fig. 3A is an oblique view showing an appearance of the MI-DFB-LD.
- Fig. 3B is a circuit diagram of the MI-DFB-LD.
- reference numeral 1 denotes a DFB laser diode
- 100 denotes a semiconductor substrate on which the semiconductor laser diode 1 and the optical modulator are formed
- 102 denotes a mounting base
- 103 denotes a sealing cover
- 105 denotes a Peltier element
- 106 denotes a lead pin having a terminal to which each electrode of the MI-DFB-LD and the Peltier element is connected
- 110 denotes a bonding wire.
- the space within the sealing cover 103 is filled with an inert gas such as nitrogen (N2), helium (He), etc.
- the impedance element does not exist in the optical module, the same problem will occur when the impedance between a ground pin of the optical module and ground is large.
- reference numeral 1 denotes a semiconductor laser diode
- 2 denotes an optical modulator
- 3 denotes a common connection element
- 82 denotes an impedance element corresponding to a bonding wire
- 4 denotes a constant current source which supplies constant current to the semiconductor laser diode 1
- 6 denotes a coaxial cable for transmitting a drive signal to the optical modulator 2
- 7 denotes a terminator resistor
- 51 denotes a resistor placed between the semiconductor laser diode 1 and the constant current source 4
- 4a denotes the parastic capacity across the constant current source and a power source line.
- Fig. 18 shows the improvement provided by the optical device of the second embodiment.
- Fig. 18 also shows a change in bit error rate in a form similar to that in Fig. 16.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Nonlinear Science (AREA)
- Semiconductor Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP161839/93 | 1993-06-30 | ||
JP16183993 | 1993-06-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0632550A2 true EP0632550A2 (fr) | 1995-01-04 |
EP0632550A3 EP0632550A3 (fr) | 1995-04-26 |
Family
ID=15742919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94304780A Withdrawn EP0632550A3 (fr) | 1993-06-30 | 1994-06-30 | Modulation de diodes laser. |
Country Status (4)
Country | Link |
---|---|
US (1) | US6044097A (fr) |
EP (1) | EP0632550A3 (fr) |
KR (1) | KR950002137A (fr) |
CA (1) | CA2127060A1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0753782A1 (fr) * | 1995-07-14 | 1997-01-15 | Nec Corporation | Modulateur optique à semi-conducteur et circuit de contrÔle |
FR2738926A1 (fr) * | 1995-09-20 | 1997-03-21 | Mitsubishi Electric Corp | Module modulateur de lumiere et procede pour fabriquer un tel module |
DE19700261A1 (de) * | 1996-07-29 | 1998-02-05 | Mitsubishi Electric Corp | Optisches Halbleiterbauelement |
EP1184949A2 (fr) * | 2000-08-28 | 2002-03-06 | Agere Systems Optoelectronics Guardian Corporation | Transmetteur laser à réaction distribuée avec modulateur intégré à électro absorption |
EP1324441A2 (fr) * | 2001-11-29 | 2003-07-02 | Mitsubishi Denki Kabushiki Kaisha | Module optique |
WO2006015723A1 (fr) * | 2004-08-07 | 2006-02-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Laser a cascade quantique a perte de puissance reduite |
EP1800421A2 (fr) * | 2004-10-15 | 2007-06-27 | Corning Incorporated | Communication par ondes radio et guides d'ondes optiques |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6937637B1 (en) * | 2000-02-01 | 2005-08-30 | Research Investment Network, Inc. | Semiconductor laser and associated drive circuit substrate |
US6593829B2 (en) * | 2001-09-06 | 2003-07-15 | Anritsu Company | Microstrip dot termination usable with optical modulators |
JP4046535B2 (ja) * | 2002-03-29 | 2008-02-13 | ユーディナデバイス株式会社 | 光半導体装置、光モジュール及び光半導体駆動回路 |
JP2003309330A (ja) | 2002-04-12 | 2003-10-31 | Sumitomo Electric Ind Ltd | 半導体光素子 |
US6941080B2 (en) * | 2002-07-15 | 2005-09-06 | Triquint Technology Holding Co. | Method and apparatus for directly modulating a laser diode using multi-stage driver circuitry |
JP2004172237A (ja) * | 2002-11-18 | 2004-06-17 | Sharp Corp | 光送信制御装置 |
US7463659B2 (en) * | 2003-07-09 | 2008-12-09 | Sumitomo Electric Industries, Ltd. | Can-type optical transmitting module utilizing a laser diode with impedance matching resistors |
US7425726B2 (en) * | 2004-05-19 | 2008-09-16 | Avago Technologies Fiber Ip Pte Ltd. | Electroabsorption modulators and methods of making the same |
JP4578164B2 (ja) * | 2004-07-12 | 2010-11-10 | 日本オプネクスト株式会社 | 光モジュール |
TWM272296U (en) * | 2005-02-18 | 2005-08-01 | Yun-Shiuan Ye | Thin-type laser module |
JP2007194365A (ja) * | 2006-01-18 | 2007-08-02 | Sumitomo Electric Ind Ltd | 光送信回路 |
JP2009177030A (ja) * | 2008-01-25 | 2009-08-06 | Opnext Japan Inc | 光送信モジュール及び光伝送装置 |
US7968902B2 (en) * | 2008-03-31 | 2011-06-28 | Bridgelux, Inc. | Light emitting devices with constant forward voltage |
US10371499B2 (en) | 2010-12-27 | 2019-08-06 | Axsun Technologies, Inc. | Laser swept source with controlled mode locking for OCT medical imaging |
JP5768551B2 (ja) * | 2011-07-13 | 2015-08-26 | 住友電気工業株式会社 | 外部変調型レーザ素子の駆動回路 |
US9441944B2 (en) | 2012-05-16 | 2016-09-13 | Axsun Technologies Llc | Regenerative mode locked laser swept source for OCT medical imaging |
JP6372511B2 (ja) * | 2016-04-01 | 2018-08-15 | 住友大阪セメント株式会社 | 光変調器 |
JP6683825B2 (ja) * | 2016-10-20 | 2020-04-22 | 日本電信電話株式会社 | 直接変調レーザ駆動回路 |
DE112018005189T5 (de) * | 2017-11-02 | 2020-07-02 | Sony Corporation | Halbleiterlaser-Ansteuerschaltung, Halbleiterlaser-Ansteuerschaltungsverfahren, Distanzmesseinrichtung und Elektronikeinrichtung |
JP7073121B2 (ja) | 2018-01-31 | 2022-05-23 | 日本ルメンタム株式会社 | 光送信サブアセンブリ及び光モジュール |
CN112166535B (zh) * | 2018-05-21 | 2024-01-16 | 谷歌有限责任公司 | 用于突发模式可调谐eml传送器的波长漂移抑制 |
CN112189287A (zh) * | 2018-05-21 | 2021-01-05 | 谷歌有限责任公司 | 突发模式激光器驱动电路 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57145385A (en) * | 1981-03-03 | 1982-09-08 | Nippon Telegr & Teleph Corp <Ntt> | Method for generating light pulse train |
JPH0218978A (ja) * | 1988-07-07 | 1990-01-23 | Sumitomo Electric Ind Ltd | 半導体レーザの駆動回路 |
JPH0282681A (ja) * | 1988-09-20 | 1990-03-23 | Fujitsu Ltd | 半導体発光装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4177436A (en) * | 1977-12-05 | 1979-12-04 | Bell Telephone Laboratories, Incorporated | Circuit for controlling the differential output power of a semiconductor laser |
FR2415332A1 (fr) * | 1978-01-20 | 1979-08-17 | Thomson Csf | Dispositif d'alimentation de source lumineuse a semi-conducteur |
-
1994
- 1994-06-29 CA CA002127060A patent/CA2127060A1/fr not_active Abandoned
- 1994-06-29 US US08/268,039 patent/US6044097A/en not_active Expired - Fee Related
- 1994-06-29 KR KR1019940015268A patent/KR950002137A/ko not_active Application Discontinuation
- 1994-06-30 EP EP94304780A patent/EP0632550A3/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57145385A (en) * | 1981-03-03 | 1982-09-08 | Nippon Telegr & Teleph Corp <Ntt> | Method for generating light pulse train |
JPH0218978A (ja) * | 1988-07-07 | 1990-01-23 | Sumitomo Electric Ind Ltd | 半導体レーザの駆動回路 |
JPH0282681A (ja) * | 1988-09-20 | 1990-03-23 | Fujitsu Ltd | 半導体発光装置 |
Non-Patent Citations (5)
Title |
---|
IEEE PHOTONICS TECHNOLOGY LETTERS, vol.2, no.12, December 1990, NEW YORK, US pages 896 - 898, XP172345 M.GOTO ET AL. 'A 10-Gb/s Optical Transmitter Module with a Monolithically Integrated Electroabsorption Modulator with a DFB Laser' * |
JOURNAL OF LIGHTWAVE TECHNOLOGY, vol.6, no.6, June 1988, NEW YORK, US pages 779 - 7785 M.SUZUKI ET AL. 'Electrical and Optical Interactions between Integrated InGaAsP/InP DFB Lasers and Electroabsorption Modulators' * |
PATENT ABSTRACTS OF JAPAN vol. 14, no. 163 (E-910) (4106) 29 March 1990 & JP-A-02 018 978 (SUMITOMO) 23 January 1990 * |
PATENT ABSTRACTS OF JAPAN vol. 14, no. 263 (E-938) (4206) 7 June 1990 & JP-A-02 082 681 (FUJITSU) 23 March 1990 * |
PATENT ABSTRACTS OF JAPAN vol. 6, no. 247 (E-146) (1125) 7 December 1982 & JP-A-57 145 385 (NIPPON DENSHI) 8 September 1982 * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0753782A1 (fr) * | 1995-07-14 | 1997-01-15 | Nec Corporation | Modulateur optique à semi-conducteur et circuit de contrÔle |
US5732097A (en) * | 1995-07-14 | 1998-03-24 | Nec Corporation | Modulating circuit for semiconductor optical modulator |
FR2738926A1 (fr) * | 1995-09-20 | 1997-03-21 | Mitsubishi Electric Corp | Module modulateur de lumiere et procede pour fabriquer un tel module |
GB2305511A (en) * | 1995-09-20 | 1997-04-09 | Mitsubishi Electric Corp | Wiring arrangement for a semiconductor light modulator |
GB2305511B (en) * | 1995-09-20 | 1997-09-24 | Mitsubishi Electric Corp | Light modulator module and method for fabricating light modulator module |
DE19700261A1 (de) * | 1996-07-29 | 1998-02-05 | Mitsubishi Electric Corp | Optisches Halbleiterbauelement |
EP1184949A2 (fr) * | 2000-08-28 | 2002-03-06 | Agere Systems Optoelectronics Guardian Corporation | Transmetteur laser à réaction distribuée avec modulateur intégré à électro absorption |
EP1184949A3 (fr) * | 2000-08-28 | 2002-09-11 | Agere Systems Optoelectronics Guardian Corporation | Transmetteur laser à réaction distribuée avec modulateur intégré à électro absorption |
EP1324441A2 (fr) * | 2001-11-29 | 2003-07-02 | Mitsubishi Denki Kabushiki Kaisha | Module optique |
EP1324441A3 (fr) * | 2001-11-29 | 2004-01-21 | Mitsubishi Denki Kabushiki Kaisha | Module optique |
US6753615B2 (en) | 2001-11-29 | 2004-06-22 | Mitsubishi Denki Kabushiki Kaisha | Optical element module |
WO2006015723A1 (fr) * | 2004-08-07 | 2006-02-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Laser a cascade quantique a perte de puissance reduite |
EP1800421A2 (fr) * | 2004-10-15 | 2007-06-27 | Corning Incorporated | Communication par ondes radio et guides d'ondes optiques |
EP1800421A4 (fr) * | 2004-10-15 | 2008-01-23 | Corning Inc | Communication par ondes radio et guides d'ondes optiques |
Also Published As
Publication number | Publication date |
---|---|
KR950002137A (ko) | 1995-01-04 |
US6044097A (en) | 2000-03-28 |
EP0632550A3 (fr) | 1995-04-26 |
CA2127060A1 (fr) | 1994-12-31 |
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